Gas burner

ABSTRACT

A gas burner has a venturi portion, a crossover portion downstream of the venturi portion and a head portion downstream of the crossover portion. The head portion includes an elongated inclined port from which a gas and air mixture issues for combustion adjacent thereto. The port has a lower region of enlarged width and an upper region of reduced width, each region being defined by a pair of spaced parallel edges. The region of reduced width has its upper termination adjacent the crossover portion whereby ignition of the gas and air mixture issuing from the port may be effected from a flame present at the crossover portion. The region of reduced width minimizes burn back.

Unite 2,828,532 4/1958 Taylor Sttes Patent 2,875,821 3/1959 AllenABSTRACT: A gas burner has a venturi portion, a crossover portiondownstream of the venturi portion and a head portion downstream of thecrossover portion. The head portion includes an elongated inclined portfrom which a gas and air mixture issues for combustion adjacent thereto.The port has a lower region of enlarged width and an upper region ofreduced width, each region being defined by a pair of spaced paralleledges. The region of reduced width has its upper termination adjacentthe crossover portion whereby ignition of the gas and air mixtureissuing from the port may be efi'ected from a flame present at thecrossover portion. The region of reduced width minimizes burn back.

PATENTE U APR 1 319m INVENTOR. RAYMOND 3. OSMERS PA ATTORNEY GAS BURNERBACKGROUND OF THE INVENTION This invention relates to an improved gasburner particularly adapted for use in a home-heating furnace.

In the manufacture of home-heating furnaces, it is desirable to be ableto standardize parts of the burner assembly so that assemblies ofdifferent B.t.u. outputs may be assembled by installing differentquantities of a standardized gas burner. These individual burners areassembled into a heat exchanger in a side-by-side relationship, thenumber depending upon the desired capacity of the furnace. Since it isdesirable to provide only a single pilot light to ignite all the burnerssimultaneously, crossover means are provided to transport the pilotflame to the adjacent burner and from that burner to the next, etc. Itis desirable also to locate the crossover means such that it does notinterfere with normal combustion after ignition has been effected. Whengas burners having a single combustion port are used it is possible, forexample, to employ a flame deflector, Le, a means to deflect the flameissuing from the combustion port of one burner to the adjacent burner toeffect crossover ignition, but the deflector remains positioned in thepath of the main flame after ignition. This may be undesirable.

It is an object 'of the present invention to provide an improved gasburner particularly adapted for use in a homeheating furnace.

It is another object of this invention to provide a single combustionport gas burner having an improved ignition crossover means.

SUMMARY OF THE INVENTION Briefly stated, in accordance with one aspectthereof, the present invention relates to a gas burner having a hollowbody adapted to receive a combustible gas and air mixture at theupstream end thereof and flow therethrough to issue at the downstreamend thereof. The body includes a head portion having spaced wallsdefining a port from which the gas and air mixture issues for combustionadjacent the port. The spaced walls have a first pair of spaced edgesdefining a region of the port having an enlarged width and a second pairof spaced edges defining a region of the port having a reduced width. Acrossover portion is provided upstream of the head portion but adjacentthe region of reduced width whereby ignition of the gas and mixtureissuing from the port may be effected from a flame present at thecrossover portion.

BRIEF DESCRIPTION OF THE DRAWING While the specification concludes withclaims particularly pointing out and distinctly claiming the subjectmatter which is regarded as the invention, it is believed the inventionwill be better understood from the description of the preferredembodiment taken in connection with the accompanying drawing, in which:

FIG. 1 is a perspective view of the gas burner of the present invention;

FIG. 2 is a top plan view of the burner of FIG 1;

FIG. 3 is a side elevation view of the burner of FIG. 1; and,

FIG. 4 is an end view of the burner of FIG. 1 looking toward the headportion thereof.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing,there is illustrated a cast iron gas burner having a venturi portion 11,a crossover portion 12 and a head portion 13 integrally forming a hollowbody 14. The upstream end 15 of body 14 is adapted to receive acombustible gas and air mixture which flows through hollow body 14 toissue at the downstream end 16.

Gas is admitted to burner 10 from an orifice 17in a pipe 170 and air isadmitted through openings 18. The gas and air mixture is thoroughlymixed as it passes through venturi portion 11. After leaving venturiportion 11, the major portion of the combustible gas and air mixtureissues from burner 10 through port 19 in head portion 13. A smallportion of the combustible gas and air mixture issues from elongatedslots 20 in crossover portion 12.

As discussed above, in a home-heating furnace the general practice is toprovide several burners, such as burner 10, in a side-by-side fashion,the exactnumber depending upon the desired capacity of the furnace. Aconventional pilot light (not shown) is provided adjacent the crossoverportion 12 of one of the burners 10. With the side-by-side relationshipof the burners, the individual crossover portions, each of whichcomprise a boss projecting laterally from body 14, are contiguous orclosely spaced from each other so that, as gas is admitted from theindividual pipes 17, the small portion of the gas and air mixture whichissues from slots 20 of bumer 10 closest to the pilot light will ignite.Because of the contiguous or closely spaced relationship of crossoverportions 12, the flame will be transported from the pilot light to allof the burners by means of the flame moving from crossover portion tocrossover portion. It is, of course, necessary to transport the flamefrom the slots 20 of the crossover portions 12 to the ports 19 in orderto effect ignition of the main portion of the gas and air mixture. Thepresent invention provides an improved means for effecting transport ofthe flame from the crossover portion 12 to the port 19.

Port 19, at its lower portion, has a region 21 of enlarged width definedby substantially parallel edges 22, and at its upper portion it has aregion 23 of reduced width defined by substantially parallel edges 24.Edges 22 and 24 comprise the upper internal extremities of walls 25 ofhead portion 13. Walls 25 are spaced from each other to form a hollowpassageway therebetween which communicates with venturi portion 11.Region 23 of port 19 extends upwardly and rearwardly and terminatesadjacent one of the slots 20. The adjacency of region 23 to slot 20 issuch so as to allow the flame to be transported from slot 20 to region23 and thus ignite the gas and air mixture issuing from port 19. Bylocating crossover portion 12 entirely upstream of head portion 13, and,more specifically, port 19, the crossover portion in no way interfereswith normal combustion taking place at port 19. However, it is necessaryto extend port 19 up through its region 23 of reduced width so that port19 and slot 20 are closely spaced to allow transport of the flame fromslot 20 to port 19.

With a gas burner having a single combustion port, such as port 19 ofburner 10, it is generally desirable to incline the port to project thecombustion flame upwardly and outwardly. Port 19 is so inclined byinclining the edges 22 and 24 defining port 19 upwardly and rearwardlytoward the upstream end of the body 14. The velocity of the gas and airmixture in the upper portion of the inclined slot 19 is relatively lowand because of this there is a tendency for the gas and air mixture toburn back into venturi portion 11 of burner 10. By providing the region23 of reduced width, the tendency for the gas and air mixture to burnback into venturi portion 11 is minimized due to the difficulty of theflame to burn back through a narrow opening. With gas pressures normallyencountered in domestic-heating furnaces a width of approximately 0.15to 0.25 inch for region 21 and a width of approximately O.I2 inch forregion 23 works well when crossover slot 20 has a width of approximately0.04 inch.

It should now be evident that the present invention provides an improvedgas burner particularly adapted for use in a home-heating furnace havingan improved crossover means which in no way interferes with normalcombustion at the main burner port.

It should be apparent to those skilled in the art that while there hasbeen described what, at present, is considered to be the preferredembodiment of this invention in accordance with the Patent Statutes,changes may be made in the disclosed apparatus without actuallydeparting from the true spirit and scope of this invention.

Iclaim:

l. A gas burner having a hollow body adapted to have a combustible gasand air mixture admitted at the upstream end thereof and flowtherethrough to issue at the downstream end thereof, comprising:

a head portion having spaced walls defining a port from which the gasand air mixture issues for combustion adjacent said port;

said spaced walls having a first pair of spaced edges defining a regionof said port having en enlarged width and a second pair of spaced edgesdefining a region of said port having a reduced width; and

a crossover portion entirely upstream of said head portion and adjacentsaid region of reduced width whereby ignition of the gas and air mixtureissuing from said port may be effected from a flame present at saidcrossover portion.

2. The invention of claim 1 wherein said head portion and said crossoverportion are integrally formed from cast iron.

3. The invention of claim 2 wherein said crossover portion comprises aboss projecting laterally from the body of said burner, said boss havingat least one elongated slot therein adjacent said region of reducedwidth.

4. The invention of claim 1 wherein said edges defining said port areinclined upwardly and rearwardly toward the upstream end of said bodywhereby said port is also inclined with its upper extremity terminatingadjacent said crossover portion.

5. A gas burner having a hollow cast iron body adapted to have acombustible gas and air mixture admitted at the upstream end thereof andflow therethrough to issue at the downstream end thereof comprising:

a venturi portion having an upstream end into which the gas and airmixture is introduced;

a crossover portion downstream of said venturi portion;

a head portion downstream of said crossover portion and having spacedwalls defining a port from which the gas and air mixture issues forcombustion adjacent said port;

said spaced walls having a first pair of spaced edges defining a regionof said port having en enlarged width and a second pair of spaced edgesdefining a region of said port having a reduced width;

said crossover portion comprising a boss projecting laterally from thebody of said burner, said boss having at least one elongated slottherein adjacent said region of reduced width; and

said edges defining said port being inclined upwardly and rearwardlytoward the upstream end of said body whereby said port is also inclinedwith its upper extremity terminating adjacent said crossover portion.

1. A gas burner having a hollow body adapted to have a combustible gasand air mixture admitted at the upstream end thereof and flowtherethrough to issue at the downstream end thereof, comprising: a headportion having spaced walls defining a port from which the gas and airmixture issues for combustion adjacent said port; said spaced wallshaving a first pair of spaced edges defining a region of said porthaving en enlarged width and a second pair of spaced edges defining aregion of said port having a reduced width; and a crossover portionentirely upstream of said head portion and adjacent said region ofreduced width whereby ignition of the gas and air mixture issuing fromsaid port may be effected from a flame present at said crossoverportion.
 2. The invention of claim 1 wherein said head portion and saidcrossover portion are integrally formed from cast iron.
 3. The inventionof claim 2 wherein said crossover portion comprises a boss projectinglaterally from the body of said burner, said boss having at least oneelongated slot therein adjacent said region of reduced width.
 4. Theinvention of claim 1 wherein said edges defining said port are inclinedupwardly and rearwardly toward the upstream end of said body wherebysaid port is also inclined with its upper extremity terminating adjacentsaid crossover portion.
 5. A gas burner having a hollow cast iron bodyadapted to have a combustible gas and air mixture admitted at theupstream end thereof and flow therethrough to issue at the downstreamend thereof comprising: a venturi portion having an upstream end intowhich the gas and air mixture is introduced; a crossover portiondownstream of said venturi portion; a head portion downstream of saidcrossover portion and having spaced walls defining a port from which thegas and air mixture issues for combustion adjacent said port; saidspaced walls having a first pair of spaced edges defining a region ofsaid port having en enlarged width and a second pair of spaced edgesdefining a region of said port having a reduced width; said crossoverportion comprising a boss projecting laterally from the body of saidburner, said boss having at least one elongated slot therein adjacentsaid region of reduced width; and said edges defining said port beinginclined upwardly and rearwardly toward the upstream end of said bodywhereby said port is also inclined with its upper extremity terminatingadjacent said crossover portion.